Definition of processionary in English:

processionary

noun

  • 1A greyish moth whose caterpillars live communally in silken tents in trees, marching out at night in procession to feed, causing substantial damage.

    1. 1.1 The larva of the processionary moth.

Pronunciation:

processionary

/prəˈsɛʃ(ə)n(ə)ri/